ZTE Speed hard reset
You can reset your ZTE device password after power on: input *983*987# in emergency dial-up pad. Select Erase everything. It will restore factory settings and your personal data will be erased.Turn off your ZTE Speed. Press Volume UP + POWER ON.
All data will be deleted!
ZTE Speed hard reset from menuOr if your phone is responding to screen input, then open Settings from the Applications menu. Tap Backup & reset > Factory data reset, click Reset phone and then Erase everything to format your phone.
To reset the ZTE Speed device from time to time for optimum performance, power off the device and remove the battery. Reinsert it and turn on your Andorid phone.